Open Source Hardware

3 Posts authored by: Cabe Atwell

casascius-1-bitcoin-obv.jpg

A physical bitcoin made by Casascious. I suppose as an attempt to make it easier to use? That coin could be have been worth anywhere between $300 - 1200 USD this past year! (via Casascius)


While bitcoins aren’t backed by a government body or well-known bank, the digital currency is still gaining ground in some communities, who will not let the concept die without a fight.

 

One community that’s taking a huge risk on the concept is the Massachusetts Institute of Technology. Next fall, MIT will give each student $100 worth of bitcoins to see how the digital currency fairs in a real-world setting. It only makes sense that MIT would sponsor such a project – after all, it does have a Bitcoin Club.

 

MIT Bitcoin Club President Dan Elitzer and colleague Jeremy Rubin organized the experiment, which includes raising half a million dollars from alumni and other donors to make the project possible. Any leftover money will go to the university to continue to enhance programs for undergraduate and potentially graduate students.

 

Elitzer hopes the experiment makes MIT the biggest bitcoin-based community on the planet. If the project is a success, it could send the value of bitcoins through the roof, as the value fluctuates based on demand, much like stocks. If you were thinking about getting in on the investment, now would be the time.

 

But what about security? While there hasn’t been specific word on just how secure use of the currency will be on campus, MIT computer scientists and faculty are working hard on preventing digital hacks, as the currency is not insured and when stolen the owner is simply out of luck.

 

The students hope that this project is the first step towards making bitcoins a widely-accepted form of currency and compare the concept to the early stages of the internet (let the kids dream), but they aren’t the only ones predicting a bright future for the electronic form of payment. A plethora of bitcoin-based gadgets are also under development, like MEVU’s wearable bitcoin bracelet.

 

While bitcoins would really have to catch on in order for the product to sell, MEVU created a Bluetooth-powered bracelet that enables users to pay for their purchases with bitcoins by a simple flick of the wrist.

 

 

The silicon bracelet is a prototype and some adjustments must be made before it ever reaches stores. For one thing, it’s based on the iOS, but most Apple apps are no longer supporting bitcoins. What is more,, most retail locations are not yet accepting bitcoins, making purchasing the bracelet to shake your band at your computer a hard sell. Nonetheless, it shows forward thinking and a lot of confidence in the technology overall.

 

Have you invested in bitcoins? It may be time to make the jump.

 

C

See more news at:

http://twitter.com/Cabe_Atwell

bitcoin logo.JPG

(via bitcoin.org)


Speaking of open source, the Bitcoin cryptocurrency source code is open. Hence, all the crazy digital currencies that have come out.

 

Bitcoins have received a fair share of criticism, but it seems most critiques of the electronic currency are a thing of the past. The digital currency is gaining widespread acceptance, including the installation of bitcoin ATMs at various locations throughout the world, the ability to pay in bitcoins at casinos in Las Vegas and even the ability to pay for tuition in the virtual coin. Goodbye paper dollars, hello bitcoins.

 

Robocoin recently created its very first Bitcoin ATM and competitors are following suit. Genesis 1 announced the creation of its bitcoin ATM, which it will feature at the 2014 ATM Industry Association U.S. Conference February 11-13 at the Loews Royal Pacific Resort at Universal Studios in Orlando, Florida. Bitcoin ATM manufacturer Lamassu has also joined the trend. It sold its 100th bitcoin ATM in December and has 120 order already placed for 2014.

 

The enthusiasm has crossed into Las Vegas, where this week two casinos announced they will be the first in the industry to accept bitcoins as currency. Both The D and Golden Gate hotels, along with select gift shops and restaurants on-site, reported they will accept the electronic currency as cash. Each cashier station at the establishments will be equipped with the electronic payment service BitPay to make the transaction seamless.

 

While it may not be a surprise that bitcoin ATMS are popping up everywhere, most probably wouldn’t assume that universities would accept the virtual coin as cash, until now. A private university in Cyprus led the charge and now the United Kingdom announced its first university to accept bitcoins. Students at the University of Cumbria can currently pay for up to two classes in bitcoins, what the university calls an experiment.

 

While there are still concerns about the security of bitcoins compared to physical currency, it certainly seems the virtual coin is catching on. Will bitcoins replace physical currency? Only time will tell.

 

C

See more news at:

http://twitter.com/Cabe_Atwell

Heddatron-05.jpg

Jane Gordon and some of the robot cast

 

Only two options: subject yourself to the insane logic of robotic whims or step off the mortal coil.


Based on the play Hedda Gabler by Henrik Ibsen (1890), and written by modern playwrite Elizabeth Meriwether, portrays the heroin Jane Gordon as a depressed, pregnant, housewife dreaming of escape in Side Show Theatre's production, Heddatron, presented on the stage of Steppenwolf's Garage Theatre. Heddatron opens showing mundane settings: a living room, kitchen, dining room. A projected video of an interview setting a tone of mystery, possible impeding disastrous events, with the seriousness of a congressional hearing. From there we follow the stories of four different sets of actors. Victorian period settings bring us insight into Henrik Ibsen's world: why he created the play, his rivalry with other characters. Jane Gordon's odyssey into loathing, madness, and robots. Jane's family-- in their sometimes violent, anti-robot --search for Jane herself. The video interview concerning the overall event. Although this sounds grave, the play is a comedy. It has many truly funny moments, and every actor is likable  The play has a sound track that make the play feel like a film. It has a few moments that will extract shock and applause from any audience. And of course, robot cast members that are unparalleled in any quality and function in any play to date. Heddatron is a must-see for any engineer.


So, where did Side Show Theatre  go for robot actors?-- Chibots, Chicago's Robot Group of 15 years. Only one person could pull it off: Eddy Wright of Wrighthobbies.net. The Wrighthobbies' "BahBot" microcontroller development board were used extensively in Heddatron's robot actors. I was able to speak with Eddy Wright about the development of the Bahbot controller, the play, and robots. The following is excerpts from our conversation.



Cabe

Did you design the robots? Are they based on anything you have ever done before?

Eddy

[Side Show Theatre] showed me some sketches, and they were a lot larger than anything I've worked on before. The "Hans" bot is 6 foot 5, and top heavy. Handling this was a big challenge. It took us over a month to just design Hans properly. We lowered the center of gravity, and it worked out well.


Cabe

Did you build them all single handedly?

Eddy

At first we had a big team, about 8-10 people on the job. But there is just so much room inside the bots for hands. So, it didn't make much sense to have 8 people on a bot simultaneously. We whittled the team as we got closer and closer to the opening date. It ended up being just me and Stuart Hecht [Chibot member] in the end finishing the up, with a diverse enough skill set to handle both hardware and software. We took parts from the other designers and added them in to the final design.



bahbots2.png

Bahbot controller


Cabe

Did you design the Bahbot controller from the ground up?

Eddy

I did it in collaboration with a gentleman named Glen Aduikas, based on one of my original development boards. [Glen] had taken my board and put a daughter board on it for an Xbee. Then another for an SD card, and then more. He sent me a picture saying 'look what I've done to your board.' I was blow away!



Cabe

Were they off the shelf modules or custom?

Eddy

He actually custom made little hand-made components for the Xbee headers. They're not custom headers. They're not .1 inch they're .05. And then the SD card slots are surface mount, so he soldered that up.  He showed it to me and said, 'we've love to have a board that could do all this stuff.' I thought that was a cool idea, but didn't think it could fit on a small board. He and I talked back and forth and before too long we were designing it with the same footprint as the original board. We ultimately got it to be the exact same size. 55mm by 65mm. We got it all packed in. They are actually stackable, or psudo-stackable, even though they have tons more packed in.



Cabe

In the beginning of the performance, several people come out with various custom looking joystick control boards. Do these also contain your Bahbot controller?

Eddy

The dual joystick are based on the Bahbot controller with XBee radios for the serial communication. All of the bots contain at least two Bahbot controllers.



Cabe

Was everything running off of your proprietary hardware?

Eddy

From the controller side to the base, yes, there's one on each side. They are talking xBee to xBee with each other. We chose to not have the base controller controlling the entire robot. We put another [Bahbot] in the robot that talks via serial connection to the original. All the information is passed from one to the next. The firsts takes the information and moves the bot accordingly and passes the information into the next Bahbot. In the case of the Billy-bot, he had some Propeller boards in it. Stuart Hecht, the other guy from Chibots I was working with, likes Propeller microcontroller.

There were a few other Atmel microcontrollers handing single jobs like a string of lights, LED flashlights, glowing objects.




Cabe

How was the propeller used?

Eddy

They work good for all the different things going on at the same time [in the Billy-bot]. There was a lot of animation in the head, neck, and the servo controller. So the multi-core capabilities in the propeller worked out well in this case.

The Bahbot has so many different functions onboard, it almost acts like a multitasking processor, like the propeller. I'm a big fan of Atmel AVR microcontrollers, so I settle in on that one as a standard. With microcontrollers at a dollar a piece, it's easy to just drop one in and tell it to do something until I tell it to stop.



Cabe

That is a lot of onboard tech. The bots moved around silently, and really smooth, what were they moving on?

Eddy

We used Paralax Wheelchair motors, with integrated numatic 8" wheels. Silent, powerful, and we could control them pretty well. And they don't drain the battery that much either.

Cabe

Controlled by a Bahbot?

Eddy

Yea, the Bahbot controls a Pololu TreX motor controller using serial         communications.



Cabe

Who wrote all the software for communication and control?

Eddy

That was me.

Once I got rolling on it, I would say it took me 25 to 50 man-hours to write the software. When I was finished with the core, I went back in and put in all kinds of fail safes. You don't want to have a robot going off on its own, or not stopping when you tell it to do. In early testing, we had a lot of drifting. Where the bot wouldn't stop for about 30 seconds. I fixed that.

The serial protocol does a CRC16, with a unique identifier on each packet, if a packet comes in without the identifier it knows it's an error. All the fail-safes are just to stop the robot.



Cabe

Only 50 hours, amazing. Any communication problems, interference?

Eddy

We did notice that the xBee uses 2.4Ghz range, and on one of the opening nights we didn't tell everyone to turn off their phones. I didn't think phones would be an issue. But smartphones aren't just phones. They have a wifi radio in them. With a 100 people in the audience, with I guess 75% of them have smartphones, we had some interference. After that, we tell everyone to turn off their phones. We haven't had any issues since.



Cabe

Is the sounds controlled by your Bahbot controllers?

Eddy

The sound is piped in externally. It was too hard to time the sounds and electronics properly. In fact each bot in controlled by two people. One for sound and another for everything else.



Cabe

What about power for the bots?

Eddy

The bots run off of off the shelf 12V SLA 7A/h onboard batteries and chargers. Some of the bots are able to give two performances on a single         charge but Brack [TV BOT] has a PC monitor and DVD player. He has to         recharge after every performance.



Cabe

So you built the hardware, and wrote the software. That is an impressive feat. Did you go to school for robotics?

Eddy

No, my degree is in software development in the early 80s. You know Fortran, Pascal.

Cabe

So all the electronic design and robotics is self taught?

Eddy

Yea, I've been working with robotics for 11 or 12 year. That's when I hooked up with Chibots. And have been learning ever since. Being self taught I've learned what I want to learn, what I need to learn. I found none of the controllers did what I wanted them to do. People liked the designs I can up with, and I started a company. And it had grew into what WrightHobbies is today.



Cabe

Has it been fun?

Eddy

It's been a great time. Opportunities like this don't come along that often. To get a chance to work on something like this, at this scale, which really challenges all our skills we have within Chibots. To ultimately produce something like Heddatron and have our share of that responsibility and accomplishment, is amazing. Audience members have been quite impressed, that these are real robots.



Cabe

Thank you for your time. And the play was amazing. I may go again, to be honest.

Eddy

Thanks. Please do. It was a pleasure talking with you.




Heddatron is playing until April 24th, 2011. Find tickets and info at the Sideshow Theater website.

hedda-poster-web.jpg




The Bahbot controller can be found at Eddy Wright's website, Wrighthobbies.net. Please note the Bahbot's wireless programming feature.


Features of the Bahbot controller:

  • ATMega1284P-20      MCU
    • 128K Programmable Flash
    • 4K EEProm
    • 16K RAM
    • 2 8-bit and 2 16-bit Timers
    • 6 PWM Channels
    • 8 ADC Channels
    • 18.432 MHz
    • Dual hardware UARTs
  • On-board      microSD card slot
  • Wireless programming
  • xBee      headers for wireless serial communications
  • All      ports brought out to 2x5 headers with power and ground
  • Standard      size, compatible with PB10 and PB20 prototyping boards and mounts to      Tamiya construction plates
  • Optional      battery monitoring circuitry, selectable power for secondary headers
  • LDO      5v regulator rated at 1A (500mA without heat sink)
  • Preloaded      Bascom Boot Loader

Specifications:

Size:

65mm X 55mm, Mounting Holes - 60mm X 50mm

Input Voltage

6.5V to 16V

Output Voltage:

5V up to 1A, 3.3V up to 250mA

microSD Slot:

up to 2GB, standard SD (HDSD in development)

xBee Headers:

Digi xBee and xBee PRO RF modules supported

Programming:

Standard 2x3 ISP header or Serial Boot Loader

Compilers:

Any Atmel AVR compatible compiler - Bascom & gcc



 

 

 

 

-Cabe Atwell

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